Frame for a baby stroller



FIG. 1 is a right side elevational view of a frame for a baby stroller showing my new design, the left side being a mirror image of that shown;

FIG. 2 is a front elevational view thereof; and,

FIG. 3 is a top plan view thereof.

The broken lines shown in FIGS. 1 through 3 are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a frame for a baby stroller, as shown and described. 